I had the same problem with my camaro.. Try replacing the belt, it did the trick for me. It only screached when it was cold. If not the belt then check out the tensioner assembly, The belt and assembly will run you about $75. Money well spent the AcDelco part numbers you want are 6k642 (about$20) and tensioner assembly number 38145(about $50) make sure you use quality parts or you will get what you pay for
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